Windows Application Icon Helper

@eisland/windows-application-icon-helper · v26.0.0

Info

Extract Windows application and process icons by name, PID, path, or shortcut via .NET NativeAOT DLL (koffi FFI). This plugin provides a unified interface for retrieving application icons as PNG buffers using Windows Shell32 APIs.

Interfaces

Interface	Description
IconResult	Icon data structure

Functions

Function	Description
getIconByProcessName	Get icon by running process name
getIconByPid	Get icon by process ID
getIconByPath	Get icon by executable file path
getIconByShortcutPath	Get icon by shortcut (.lnk) path

Tips

All icon functions return IconResult | null. The result contains PNG image data, size, and format. Returns null when the icon cannot be found or the target doesn't exist.

Build

Command	Script	Description
npm run build	dotnet publish -c Release -r win-x64	Build Native AOT DLL
npm run clean	dotnet clean	Clean build artifacts
npm run rebuild	npm run clean && npm run build	Clean and rebuild

Warning

The build requires .NET 10 SDK and Visual Studio Build Tools with C++ workload installed. The Windows SDK path must be correctly configured.

Test

Command	Script	Description
npm test	vitest run	Run all unit tests
npm run test:icon	vitest run test/icon.test.ts	Run icon tests only
npm run smoke	node test/icon.smoke.ts	Run all smoke tests
npm run smoke:process-name	node test/icon.by-process-name.smoke.ts	Test process name lookup
npm run smoke:pid	node test/icon.by-pid.smoke.ts	Test PID lookup
npm run smoke:path	node test/icon.by-path.smoke.ts	Test path lookup
npm run smoke:shortcut	node test/icon.by-shortcut.smoke.ts	Test shortcut lookup

Note

Smoke tests require manual execution and display results in the console. Unit tests run automatically via Vitest.

Source Files

File	Responsibility
index.js	Main entry point, exports all functions
index.d.ts	TypeScript type declarations
ffi-loader.js	koffi FFI bridge to Native AOT DLL
src/IconExtractor.cs	Core icon extraction logic (Win32 APIs)
src/Exports.cs	C ABI exports for FFI
src/eIslandAppIconHelper.csproj	.NET 10 Native AOT project

Important

The DLL uses ExtractAssociatedIconW from Shell32 for icon extraction and COM IShellLink for shortcut resolution.